I hate math......?

Question

need some help with this math work, would be greatly appreciated.

Stuff looks like this

Graph x+2y>-6 (supposed to be greater than less than but i dont know how to insert that lol)

Factor y(squared)+2y-63

and last but not least.

multiply (5x-y+2z)(5x-y-2z) i think i know how to do this 1 but not positive.

any help would be greatly appreciated.

Answer 1

1. I don't understand the first one. Is it greater than or less than....can't be both.
2. y^2 + 2y -63.......(y + 9)(y - 7) List the factors of 63...1 x 63,,3 x 21...7 x 9. This gives you the last term. Since the end term is negative, one term has to be positive and one term negative. Now add and subtract your factors until you get an answer of 2. Since you need the middle term to be positive, the larger number must be positive.
3. 25x^2 + y^2 - 4z^2. Multiply like terms and be careful of the signs.